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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
​
</body>
</html>
 
var user = {
        role: 'tester',
        permissions: [
            'execute',
            'write'
        ]
    }, 
    UserRoleScheme = function (user) {
        
        var write = 'write';
      
        function getUrl (subUrl) {
            if (user.permissions.indexOf(write) > -1) {
                return 'https://www.myapp.com/' + subUrl + '/admin';
            } else {
                return 'https://www.myapp.com/' + subUrl + '/index';
            }
        }
      
        function logUserRole () {
          console.log('the current user is ' + user.role);
        }
      
        this.tester = function () {
            logUserRole ();
            return getUrl('testers');
        };
        
        this.developer = function () {
            logUserRole ();
            return getUrl('developers');
        };
        
        this.manager = function () {
            logUserRole ();
            return getUrl('managers');
        };
        
        this.devops = function () {
            logUserRole ();
            return getUrl('devops');
        };
        
        this.executive = function () {
            logUserRole ();
            return getUrl('executives');
        };
        
        this.default = function () {
            console.log('error: the user does not have a role.');
            return 'https://www.myapp.com/error?type=unauthorized';
        };
    },
    currentRoleHandler = new UserRoleScheme(user);
​
if (currentRoleHandler[user.role]) {
    console.log(currentRoleHandler[user.role]());
} else { //otherwise call the default strategy
    currentRoleHandler['default']();
}
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